Abstract
The effects of the application of ultrasound field (USF) on the combustion velocity and temperature during SHS as well as on the microstructure of the final product are described. The influence of USF on SHS is connected with a thermal factor (forced convection of ambient gas) and nonthermal, or physical factor. The latter is due to changes in the capillary spreading of a transient melt and nucleation conditions of solid products in the SHS wave. For the Ti-C-Ni-MO system, an optimal amplitude of ultrasound exists at which the uniformity of grain size of titanium carbide is substantially improved.
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